Nature is relentless and unchangeable, and it is indifferent as to whether its hidden reasons and actions are understandable to man or not.

Philosophy is written in that great book which ever lies before our eyes — I mean the universe — but we cannot understand it if we do not first learn the language and grasp the symbols, in which it is written.

All truths are easy to understand once they are discovered; the point is to discover them.

They who depend upon manifest observations will philosophize better than those who persist in opinions repugnant to the senses.

Knowing thyself, that is the greatest wisdom.

In time you may discover everything that can be discovered, and still your progress will only be progress away from humanity. The distance between you and them can one day become so great that your joyous cry over some new gain could be answered by an universal shriek of horror.

Science proceeds more by what it has learned to ignore than what it takes into account.